Why these unallocated spaces on disk ?

[moon_raker]

I installed last month using manual partitioning from the live cd and saw only today that I have these 2x 1MB unallocated spaces as shown in the screenshot. A notebook where I used the same manual partitioning method also has this. Any ideas ? I certainly don't want to reinstall as all is fine on both machines.

[zvacet]

Download Gparted live cd (http://gparted.sourceforge.net/) and with it expand your existing partition to the left and to the right on unallocated space.

[efflandt]

10.04 by default aligns partitions differently, on 1 MB boundaries, instead of just on cylinder boundaries. That can break some systems (like my older desktop with Asus mobo), but you can change that if you want to with partman/alignment=cylinder kernel boot parameter.

https://wiki.ubuntu.com/LucidLynx/ReleaseNotes#Partition%20alignment%20changes%20may %20break%20some%20systems

Although, I still cannot figure out why I cannot boot from from an ext3 partition on the far end of a 500 GB USB drive on that problem PC (grub rescue error: unknown filesystem). When using the above boot parameter to install, it is able to boot a 160 GB USB drive and from farther out on its 200 GB internal drive.

[moon_raker]

10.04 by default aligns partitions differently, on 1 MB boundaries, instead of just on cylinder boundaries. That can break some systems (like my older desktop with Asus mobo), but you can change that if you want to with partman/alignment=cylinder kernel boot parameter.

https://wiki.ubuntu.com/LucidLynx/ReleaseNotes#Partition%20alignment%20changes%20may %20break%20some%20systems



That makes sense to me, thanks efflandt. I will just leave as is.

[totemtigger]

10.04 by default aligns partitions differently, on 1 MB boundaries, instead of just on cylinder boundaries. That can break some systems (like my older desktop with Asus mobo), but you can change that if you want to with partman/alignment=cylinder kernel boot parameter.

https://wiki.ubuntu.com/LucidLynx/ReleaseNotes#Partition%20alignment%20changes%20may %20break%20some%20systems

Although, I still cannot figure out why I cannot boot from from an ext3 partition on the far end of a 500 GB USB drive on that problem PC (grub rescue error: unknown filesystem). When using the above boot parameter to install, it is able to boot a 160 GB USB drive and from farther out on its 200 GB internal drive.
thanks efflandt. I also was curious about this but not enough to ask.